ATX (Advanced Technology eXtended) is a motherboard configuration specification developed SFX; TFX; WTX; AMD GES; 5 EPS12V ATX also made the PS/2-style mini-DIN keyboard and mouse connectors Power Supply Design Guide, v ยท EPS12V Power Supply Design Guide v Insignia W ATX12V /EPS12V Power Supply: Designed to power select computers; W continuous power; ATX12V /EPS12V Specifications. We’ll answer PSU spec questions of modular vs. non-modular PSUs, EPS12V vv The EPS (Entry-level Power Supply) standard is.

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Power supply unit computer. The power was slightly increased on all rails.

ATX – Wikipedia

A number of manufacturers have added one, two or three additional expansion slots at the standard 0. SFX is merely a design for a power supply casing, with the power specifications almost identical to ATX. Once the output power is ready to use, the Power Good signal tells the digital circuitry that it can begin to operate. Archived from the original on By using this site, you agree to the Terms of Use and Privacy Policy. The wires are either soldered to the power button making it difficult to replace the power supply if it failed or blade receptacles were used.

A label on one side of the box lists technical information about the power supply, including safety certifications and maximum output power. Archived from the original on September 19, The current limits for each group of cables is then documented so the user can avoid placing too many high-current loads in the same group.

As of ATX 2. A power supply rail or voltage rail refers to a single voltage provided by a power supply unit PSU.

Misquoted and misunderstood” PDF. Other minor changes were introduced.

From Wikipedia, the free encyclopedia. The original ATX specification called for a power supply to be located near to the CPU with the power supply fan drawing in cooling air from outside the chassis and directing it onto the processor. However, some early model Athlon XP and MP boards including some server boards and later model lower-end motherboards do not have spe 4-pin connector as described below.


This page was last edited on 31 Decemberat Note each larger size inherits all previous smaller colors area. Retrieved February 6, The added length could have allowed placement of up to eight expansion slots, but the top slot position is vacant on this particular model.

The fan placement can be used to efficiently exhaust air from the processor and core area of the motherboard, making possible smaller, more efficient systems using common industry components.

Power supply unit (computer) – Wikipedia

The energy 922 of a power supply drops significantly at low loads. Since certain variants, CPUs use lower operating voltages such as 3. The main issues to consider are the following:. This the unofficial name given to the later revisions of the v2. Retrieved February 6, ATX power supplies are turned on and off by a signal from the motherboard.

Proprietary motherboard designs such eos12v those by Compaq, Packard-Bell, Hewlett Packard and others existed, and were not interchangeable with multi-manufacturer boards and cases. Each rail delivers up to a limited amount of current through one or more cables, and each rail is independently controlled by its own current sensor which shuts down the supply upon excess current.

This is the simple design of a passive PFC. A modular power supply provides a detachable cable system, offering the ability to spev unused connections at the expense of a small amount of extra electrical resistance introduced by the additional connector. Diagram of a typical XT and AT voltage regulator circuit. ATX uses one large, keyed connector which can not be connected incorrectly.

The Apple II design by Atari engineer Rod Holt was awarded a patent, [2] [3] and was in the vanguard of modern computer power supply design. The desktop computer power supply changes alternating current from a wall socket to low-voltage direct current to operate the processor and peripheral devices. Unlike a fuse or circuit breakerthese limits reset as soon as the overload is removed. Retrieved July 12, A power supply that is self-certified by its manufacturer may claim output ratings double or more than what is actually provided.


Voltage drop on connectors forced the designers to place such buck converters next to the device.

Green computing and 80 Plus. The curve varies from model to model examples of how this curve looks can be seen on test reports of energy efficient models found on the 80 Psec website. When the power factor correction PFC was required, those filter capacitors were replaced with higher-capacity ones, together with a coil installed in series to delay the inrush current.

In a common variant found in tower cases, the line-voltage switch was connected to the power supply with a short cable, allowing it to be mounted apart from the power supply.

This voltage was required by the ISA bus, which is no longer present on almost all modern computers. So the capacity inflation factor’s hit 2.

Power supply unit (computer)

When the switch on the power supply is turned off, however, the computer cannot be turned on with the front power button. A minimum load on one or more voltages may be required varies by model and vendor ; the standard does not specify operation without a minimum load and a conforming PSU may shut down, output incorrect voltages, els12v otherwise malfunction, but will not be hazardous or damaged. Power supplies label their total power output, and label how this is determined by the electrical current limits for each of the voltages supplied.

This low-voltage control allows other hardware or software to turn the dpec on and off.